Buggy code:
public class MainView extends JFrame { private static MainView instance = null ; private ResourceBundle bundle = ResourceBundle . getBundle ( "com//t_oster//visicut//gui//resources//MainView" ) ; private FacebookDialog facebookDialog = null ; private ParameterPanel parameterPanel = new ParameterPanel ( ) ; public static MainView getInstance ( ) { } protected final DialogHelper dialog = new DialogHelper ( this , this . getTitle ( ) ) { @ Override public void showWarningMessage ( String text ) { } @ Override public void showSuccessMessage ( String text ) { } @ Override public void showInfoMessage ( String text ) { } @ Override public void showErrorMessage ( Exception ex ) { } @ Override public void showErrorMessage ( Exception cause , String text ) { } @ Override public void showErrorMessage ( String text ) { } } ; private boolean ignoreLaserCutterComboBoxUpdates ; public MainView ( File loadedFile ) { } public LaserProfile editLaserProfile ( LaserProfile profile ) { } public MainView ( ) { } private ActionListener exampleItemClicked = new ActionListener ( ) { public void actionPerformed ( ActionEvent ae ) { } } ; private void fillMenu ( JMenu parent , Map < String , Object > map ) { } private JMenuItem openExamples ; private void refreshExampleMenu ( ) { } private void refreshRecentFilesMenu ( ) { } private void refreshMaterialComboBox ( ) { } private void fixMaterialThicknesses ( ) { } private void fillComboBoxes ( ) { } private void refreshLaserDeviceComboBox ( ) { } public void refreshObjectComboBox ( ) { } @ SuppressWarnings ( "unchecked" ) private void initComponents ( ) { } private void exitMenuItemActionPerformed ( ActionEvent evt ) { } public void loadFile ( File file , final boolean discardCurrent ) { } private void fitObjectsIntoBed ( ) { } private void loadFileReal ( File file , boolean discardCurrent ) { } private void refreshButtonStates ( ) { } private File lastDirectory = null ; private void openFileDialog ( boolean discardCurrent ) { } private void openMenuItemActionPerformed ( ActionEvent evt ) { } private void editMappings ( ) throws FileNotFoundException , IOException { } private void aboutMenuItemActionPerformed ( ActionEvent evt ) { } private int jobnumber = 0 ; private void executeJob ( ) { } private void executeJobButtonActionPerformed ( ActionEvent evt ) { } private void filesDropSupport1PropertyChange ( PropertyChangeEvent evt ) { } private void save ( ) { } private void saveAsMenuItemActionPerformed ( ActionEvent evt ) { } private void visicutModel1PropertyChange ( PropertyChangeEvent evt ) { } private void saveMenuItemActionPerformed ( ActionEvent evt ) { } private void newMenuItemActionPerformed ( ActionEvent evt ) { } private void calibrateCameraMenuItemActionPerformed ( ActionEvent evt ) { } private void executeJobMenuItemActionPerformed ( ActionEvent evt ) { } private boolean capturing = false ; private void captureImage ( ) { } public boolean isVisiCamDetected ( ) { try { String url = this . visicutModel1 . getSelectedLaserDevice ( ) . getCameraURL ( ) ; <START_BUG> return ! ( "" . equals ( url ) ) ; <END_BUG> } catch ( Exception e ) { return false ; } } public String getVisiCam ( ) { } @ Action public void zoomIn ( ) { } @ Action public void zoomOut ( ) { } private void captureImageButtonActionPerformed ( ActionEvent evt ) { } private void editMappingMenuItemActionPerformed ( ActionEvent evt ) { } private boolean ignoreMaterialComboBoxChanges = false ; private void materialComboBoxActionPerformed ( ActionEvent evt ) { } private void materialMenuItemActionPerformed ( ActionEvent evt ) { } private void laserCutterComboBoxActionPerformed ( ActionEvent evt ) { } private void jMenuItem2ActionPerformed ( ActionEvent evt ) { } private void calculateTimeButtonActionPerformed ( ActionEvent evt ) { } private void jButton1ActionPerformed ( ActionEvent evt ) { } private void jButton2ActionPerformed ( ActionEvent evt ) { } private void jmExportSettingsActionPerformed ( ActionEvent evt ) { } private void jmImportSettingsActionPerformed ( ActionEvent evt ) { } private void jmManageLaserprofilesActionPerformed ( ActionEvent evt ) { } private void btAddMaterialActionPerformed ( ActionEvent evt ) { } private void jmInstallInkscapeActionPerformed ( ActionEvent evt ) { } private void jmInstallIllustratorActionPerformed ( ActionEvent evt ) { } private void btAddMaterialThicknessActionPerformed ( ActionEvent evt ) { } private void cbMaterialThicknessActionPerformed ( ActionEvent evt ) { } private void btFitScreenActionPerformed ( ActionEvent evt ) { } private void bt1to1ActionPerformed ( ActionEvent evt ) { } private void importMenuItemActionPerformed ( ActionEvent evt ) { } private void btRemoveObjectActionPerformed ( ActionEvent evt ) { } private void btAddObjectActionPerformed ( ActionEvent evt ) { } private boolean ignoreObjectComboBoxEvents = false ; private void objectComboBoxChangeHandler ( ItemEvent evt ) { } private void jmPreferencesActionPerformed ( ActionEvent evt ) { } private void btFacebookActionPerformed ( ActionEvent evt ) { } private String browserLoginDialog ( String title , String loginUrl , String redirectUrlPrefix ) throws Exception { } private String systemBrowserLogin ( String name , String loginUrl ) throws Exception { } private boolean isJavaFxAvailable ( ) { } private JMenuItem aboutMenuItem ; private JButton bt1to1 ; private JButton btAddMaterial ; private JButton btAddMaterialThickness ; private JButton btAddObject ; private JButton btFacebook ; private JButton btFitScreen ; private JButton btRemoveObject ; private ButtonGroup buttonGroup1 ; private JButton calculateTimeButton ; private JMenuItem calibrateCameraMenuItem ; private JButton captureImageButton ; private JComboBox cbMaterialThickness ; private JMenuItem editMappingMenuItem ; private JMenu editMenu ; private JButton executeJobButton ; private JMenuItem executeJobMenuItem ; private JMenuItem exitMenuItem ; private JMenu fileMenu ; private FilesDropSupport filesDropSupport1 ; private JMenu helpMenu ; private JMenuItem importMenuItem ; private JButton jButton1 ; private JButton jButton2 ; private JCheckBox jCheckBox1 ; private JLabel jLabel1 ; private JLabel jLabel10 ; private JLabel jLabel2 ; private JLabel jLabel5 ; private JLabel jLabel9 ; private JMenu jMenu1 ; private JMenuItem jMenuItem2 ; private JPanel jPanel2 ; private JScrollPane jScrollPane1 ; private JScrollPane jScrollPane2 ; private JSeparator jSeparator1 ; private JMenu jmExamples ; private JMenuItem jmExportSettings ; private JMenu jmExtras ; private JMenuItem jmImportSettings ; private JMenuItem jmInstallIllustrator ; private JMenuItem jmInstallInkscape ; private JMenuItem jmManageLaserprofiles ; private JMenuItem jmPreferences ; private JCheckBoxMenuItem jmShowPhoto ; private ImageComboBox laserCutterComboBox ; private MappingPanel mappingPanel ;

Fix:
return ( url != null ) && ( ! ( "" . equals ( url ) ) ) ;